Senior Java Backend Developer / Integration Engineer

Hive-X

United States

United States

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About

We are looking for a 5 Senior Java Backend Developers / Integration Engineers to strengthen the team working in pharma sector, a strategic integration platform in the healthcare ecosystem. This role is ideal for someone who enjoys building reliable backend services, secure APIs, event-driven integrations, and cloud-connected data flows in a modern Java environment.
Mission You will join a team responsible for the evolution of the solution, a multi-module platform built around integration, interoperability, security, and data exchange.
Responsibilities
Designing and implementing backend features in a modern Java stack
Building and maintaining secure APIs and gateway flows
Developing integrations with external systems and healthcare partners
Working on event-driven communication and asynchronous processing
Contributing to data persistence, migration, and operational reliability
Supporting cloud-based data exchange patterns and AWS-connected services
Ensuring code quality through unit and integration testing
Collaborating closely with analysts, architects, and product stakeholders
Tech Environment The current stack includes:
Spring Boot 4
Spring Cloud Gateway
Spring WebFlux
Spring Security
Spring Data JPA
MariaDB
Flyway
Redis
JWT / OAuth2 Resource Server
AWS SDK with S3 , Glue , Athena
OpenAPI / Springdoc
Jackson
Parquet / Hadoop
Maven
JUnit 5 / Mockito
Qualifications
Strong experience in backend development with Java and Spring
Solid knowledge of API design, security, and system integration
Experience with relational databases such as MariaDB or MySQL
Experience with messaging platforms such as Kafka
Familiarity with cloud environments, ideally AWS
Good understanding of authentication and authorization mechanisms such as JWT and OAuth2
A quality-driven mindset with attention to testing, maintainability, and production reliability
The ability to work autonomously while collaborating effectively with a broader team
Nice to Have
Experience with Spring Cloud Gateway or API gateway patterns
Experience with Redis
Exposure to healthcare, interoperability, or regulated environments
Experience with data pipelines or analytical storage flows using S3 / Athena / Glue
Familiarity with hexagonal architecture or domain-driven design principles
Benefits
Strategic project with real business and integration impact
Modern Java and Spring ecosystem
Combination of backend engineering, integration, security, and cloud topics
Collaborative team environment
Opportunity to contribute to a platform used in a sensitive and meaningful domain
Practical Information
Location: Belgium / hybrid possible
Engagement: freelance or employee, depending on profile
Duration: long-term reinforcement for the team
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English

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